godot-steering-ai-framework/project/demos/pursue_vs_seek/Player.gd

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GDScript3
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extends "res://demos/pursue_vs_seek/Ship.gd"
# Controls the player ship's movements based on player input.
onready var agent: = GSTSteeringAgent.new()
export var thruster_strength: = 250.0
export var side_thruster_strength: = 10.0
export var max_velocity: = 300.0
export var max_angular_velocity: = 2.0
export var angular_drag: = 0.025
export var linear_drag: = 0.025
var _linear_velocity: = Vector2()
var _angular_velocity: = 0.0
func _physics_process(delta: float) -> void:
var movement: = _get_movement()
_angular_velocity = _calculate_angular_velocity(
movement.x,
_angular_velocity,
side_thruster_strength,
max_angular_velocity,
angular_drag,
delta
)
rotation += (_angular_velocity * delta)
_linear_velocity = _calculate_linear_velocity(
movement.y,
_linear_velocity,
Vector2.UP.rotated(rotation),
linear_drag,
thruster_strength,
max_velocity,
delta
)
_linear_velocity = move_and_slide(_linear_velocity)
_update_agent(_linear_velocity, rotation)
func _calculate_angular_velocity(
horizontal_movement: float,
current_velocity: float,
thruster_strength: float,
max_velocity: float,
ship_drag: float,
delta: float) -> float:
var velocity: = clamp(
current_velocity + thruster_strength * horizontal_movement * delta,
-max_velocity,
max_velocity
)
velocity = lerp(velocity, 0, ship_drag)
return velocity
func _calculate_linear_velocity(
vertical_movement: float,
current_velocity: Vector2,
facing_direction: Vector2,
ship_drag_coefficient: float,
strength: float,
max_speed: float,
delta: float) -> Vector2:
var actual_strength: = 0.0
if vertical_movement > 0:
actual_strength = strength
elif vertical_movement < 0:
actual_strength = -strength/1.5
var velocity: = current_velocity + facing_direction * actual_strength * delta
velocity = velocity.linear_interpolate(Vector2.ZERO, ship_drag_coefficient)
return velocity.clamped(max_speed)
func _get_movement() -> Vector2:
return Vector2( Input.get_action_strength("sf_right") - Input.get_action_strength("sf_left"),
Input.get_action_strength("sf_up") - Input.get_action_strength("sf_down"))
func _update_agent(velocity: Vector2, orientation: float) -> void:
agent.position.x = global_position.x
agent.position.y = global_position.y
agent.linear_velocity.x = velocity.x
agent.linear_velocity.y = velocity.y
agent.angular_velocity = _angular_velocity
agent.orientation = orientation